Variable Thickness Magnetic Body for Wireless Power Coil
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless power transmission systems, the use of magnetic bodies to enhance magnetic coupling between coils can lead to overheating issues while increasing the weight and complexity of the coil units, necessitating a solution that minimizes magnetic body usage while preventing overheating.
Innovation Solution
A coil unit configuration featuring a magnetic body with specific overlapping areas and distances to distribute magnetic flux efficiently, reducing heat generation and minimizing the amount of magnetic material used, including a spiral coil design with openings that alter the magnetic flux path to avoid concentration on shortest paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic body is used to enhance magnetic coupling between coils, then the inductance and magnetic coupling are improved, but the coil unit becomes heavier and the magnetic body may overheat
Solution Approach 1:
The magnetic body is designed with spatially varying thickness: a first area with greater thickness positioned closer to the coil, and a second area with lesser thickness positioned farther from the coil. This local quality variation optimizes magnetic coupling where needed while reducing overall magnetic material usage and weight.
Solution Approach 2:
The invention changes the geometric parameter (thickness) of the magnetic body across different spatial regions. By varying the thickness parameter from the first area to the second area, the design achieves optimal magnetic coupling performance while minimizing weight and heat generation.
2Reliability
If a magnetic body is used to enhance magnetic coupling, then the inductance is improved, but the amount of magnetic material increases
Solution Approach 1:
The magnetic body employs non-uniform thickness distribution with a first area having greater thickness near the coil and a second area having lesser thickness farther away. This local quality approach ensures sufficient inductance where the magnetic field is strongest while reducing magnetic material quantity in regions where less material is needed.
Solution Approach 2:
Instead of using uniform thickness throughout, the invention applies magnetic material partially with varying quantities - greater thickness where it provides maximum benefit (first area) and lesser thickness where less is required (second area), optimizing the balance between inductance and material usage.
3Reliability
If magnetic flux passes through the magnetic body, then magnetic coupling is enhanced, but the magnetic body reaches an overheated state due to flux concentration
Solution Approach 1:
The varying thickness design creates different magnetic resistance characteristics in different areas. The first area with greater thickness handles higher flux density closer to the coil, while the second area with lesser thickness reduces flux concentration farther away, preventing overheating while maintaining coupling efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively inhibits overheating while reducing the amount of magnetic material required, enhancing the efficiency and reliability of wireless power transmission by managing magnetic flux distribution and density.
Implementation Method 1
magnetic flux passes through the inside of a magnetic body having lower magnetic resistance than that air
Implementation Method 2
magnetic body having lower magnetic resistance than that air
Implementation Method 3
a power transmission coil and a power receiving coil are respectively disposed above magnetic bodies
Data Source
AI summary
A coil unit capable of inhibiting overheating in a magnetic body while the amount of the magnetic body used is reduced includes a magnetic body and a coil with an opening, the magnetic body overlaps the coil in a first direction and includes first, second, and third areas, the first area includes first and second faces, the second area includes third and fourth faces, the third area includes fifth and sixth faces, a first distance between the fifth face and the coil is shorter than a second distance between the second face and the coil and is longer than a third distance between the first face and the coil, a fourth distance between the third face and the coil is shorter than the first distance, and a fifth distance between the fourth face and the coil is longer than the third distance.